Halogenated butyl interlayer for reinforced elastomeric hose articles

Abstract

A composite reinforced vulcanized elastomeric hose is disclosed including a tube, an outer cover, an interlayer interposed between the tube and cover, and a reinforcement embedded in the hose wall. The outer cover and inner tube are composed of dissimilar polymers not readily bondable to one another, one of which is an EPDM type, and the interlayer is composed of halogenated butyl which securely bonds the dissimilar polymers together and provides a low permeability internal fluid barrier for the hose article with protection to the embedded reinforcement.

What is claimed is: 
     
       1. A unitary reinforced vulcanized elastomeric hose article for conveying fluids including an inner tube and outer cover which are composed of dissimilar polymers not readily bondable to one another comprising: an inner heat setting elastomeric tube of a given permeability to the conveyed fluids and composed of a terpolymer of mixed mono-olefins and polyolefins;   an outer heat setting elastomeric cover;   a reinforcement embedded within the hose article and telescoped over and free from contact with the inner tube; and   an elastomeric tie gum layer of a heat setting halogenated butyl interposed between and mutually securely bonded to each of said inner tube and outer cover;   said tie gum layer exhibiting a substantially lower permeability to the conveying fluids than said given permeability to thereby provide an internal fluid barrier for the hose article and protection to the embedded reinforcement.   
     
     
       2. The hose of claim 1 wherein the tube is composed of an EPDM-type terpolymer having low unsaturation. 
     
     
       3. The hose of claim 2 wherein the halogenated butyl is chlorinated butyl. 
     
     
       4. The hose of claim 1 wherein the reinforcement consists of at least one layer of a woven fabric. 
     
     
       5. A composite reinforced vulcanized elastomeric hose for conveying fluids comprising: a first heat setting elastomeric annular member of a determinable permeability to the fluid to be conveyed comprised of a copolymer of mixed mono-olefins and polyolefins;   a second heat setting elastomeric annular member of a material dissimilar from said copolymer and not readily bondable therewith and spaced from the first annular member;   a reinforcement embedded within the hose composite and free from contact with said first annular member;   an interlayer of a heat setting halogenated butyl elastomer interposed between and mutually bonded to each of said first and second annular members, said interlayer exhibiting a permeability which is less than the permeability of said first annular member to thereby erect a fluid barrier internally within the wall of the hose composite.   
     
     
       6. The hose of claim 5 wherein the first annular member serves as an inner tube for the hose. 
     
     
       7. The hose of claim 5 wherein the first annular member serves as an outer cover for the hose. 
     
     
       8. The hose of claim 6 wherein the second annular member serves as an outer cover for the hose, and the reinforcement is embedded in the outer cover and fully encapsulated therein so as to be spaced from said interlayer. 
     
     
       9. The hose of claim 6 wherein the second annular member serves as an outer cover for the hose, and the reinforcement is in mutual contact with each of said outer cover and interlayer. 
     
     
       10. A helically corrugated flexible reinforced vulcanized hose for conveying fluids having a spiral high modulus reinforcing member embedded in the corrugations of the hose body, comprising: a corrugated inner tube composed of EPDM having a determinable permeability to the conveyed fluids, said spiral reinforcing member being positioned at substantially the crests of the corrugations of the inner tube; and   an outer rubberized fabric embedded cover securely bonded to the inner tube, comprising: a skim rubber layer positioned adjacent the fabric and forming the outermost surface of the hose, said skim rubber layer being dissimilar from and not readily bondable to the EPDM; and   a tie gum layer composed of halogenated elastomer interposed between and mutually bonded to the EPDM inner tube and skim rubber layer and in intimate bonding contact with the fabric, the tie gum layer isolating the inner tube from contact with the fabric reinforcement;     said tie gum layer exhibiting a substantially lower permeability to the conveyed fluids than the EPDM to thereby provide an internal fluid barrier for the hose article and protection to the embedded fabric.   
     
     
       11. The hose of claim 1 wherein the reinforcement is a fibrous textile reinforcement layer in which the individual fibers are spaced substantially away from one another to define interstices therebetween, and wherein the textile reinforcement layer is in direct contact with and interposed respectively between said outer elastomeric cover and elastomeric tie gum layer, and wherein the elastomeric material of the cover and of the tie gum layer make interfacial bonding contact within said interstices. 
     
     
       12. A composite reinforced vulcanized elastomeric hose for conveying fluids comprising: a first heat setting elastomeric annular member of a determinable permeability to the fluid to be conveyed comprised of a copolymer of mixed mono-olefins and polyolefins;   a second heat setting elastomeric annular member of a material dissimilar from said copolymer and not readily bondable therewith, and spaced from the first annular member, one of said annular members serving as an inner tube for the hose composite;   a fibrous textile reinforcement layer embedded within the hose composite and free from contact with said annular member serving as the inner tube for the hose;   an interlayer of a heat setting halogenated butyl elastomer interposed between and mutually bonded to each of said first and second annular members, said interlayer exhibiting a permeability which is less than the permeability of said first annular member to thereby erect a fluid barrier internally within the wall of the hose composite; and   said fibrous textile reinforcement layer having individual fibers spaced substantially away from one another to define interstices therebetween, and wherein the textile reinforcement layer is in direct contact with and interposed respectively between said elastomeric interlayer and the elastomeric annular member which is spaced away from the annular member serving as the inner tube, and wherein the elastomeric material of the interlayer penetrates within said interstices and makes interfacial bonding contact with the elastomeric material of the annular member spaced away from the inner tube.